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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de22f92444732b06759ce9f6861443656e47f1002e260f851eaa8554e7a5e4d6' 
  AND token = 'wx5zWO3J6eDbV8i+M3FnXImmCnSX/Mz0yJCgCC43j50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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