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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '753d5a03632d797a77329dfa4560f804841102d3e3bacfcb6ed52d1652f04faf' 
  AND token = '4WKujEtyMTfkrs4McXls9oWJhh0RPXbizeY8pfb0Af8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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