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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa0613d049a5e25528f49cf8917e7a0f0b74369d8f506342244465c0c45de086' 
  AND token = 'fNDiKDQUeqpoXzy/wwLgxyJTaJ5Mkwi0n4dOtHMxmkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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