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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef66975f5650ec9cf04062e8a3dec003c4e3ba1b832d6ff4e696397757865c5c' 
  AND token = 'GfScQPFtFdE2Ooic2xETogYbhahd5NE3uUWf7sWaeXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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