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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '819c6bea9b79f1fde4404392049fe7f588b2d2868e1304b5eede865a19e4d31b' 
  AND token = 'AtFB6eQL7tL90H2YbO+P3dki4qqcamTBDEu99XQVoQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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