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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ef4d9e94fa2acde83e3ed6d0e1662ce62177ba1a19aaae2a7418440931c9a3' 
  AND token = '5Dz7p6PzwgRsUFZT2qXg3dy6ynSRBBDdkmtvn4R3VgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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