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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0276b42a9298382f1f185d5627e675a62c52ae9922f450deb76425e06a6e60a' 
  AND token = 'cSznUAkWOTp09QXFC52zdTlQye4g1obFwhFJGz/a4pU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}