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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '182555e6ddbb58763e2f3464d45718c7fcbf095d167b59d6c0e60a5efc3d1bde' 
  AND token = 'rBk3lET/IIpzSwozAG60qj5hyISKaGsWIOjIFXXIEsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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