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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e329a43df2499884c0506b7c50e9ee851f9144087160e2f58ad7cb226e51a0c5' 
  AND token = 'Iu1u5QGTp+PEpOJeyTTmuZZs/EF8eLvcufnX7DcNhkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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