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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc782f49092e910aae1bcb96873482b94d52490fe4d7804e323e2cf2b4c5ab5' 
  AND token = 'FnILbT3uad/jnfzFLDu5oNhtGrEC1+xzZNZqGs7aZRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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