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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd29c4d12704b3522457670970bb56b61bb70032aec59df8ea9eed83e4eb370e' 
  AND token = 'oCFRBjIRTl3wiksFC7dYc/RCwodowDBAxfxxAicL2fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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