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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032f81ea624a2f691e6f90d50896240436415a18a5a8af3f8fe42091f18ccfd2' 
  AND token = '1PxYTIfnm8tV5C/zhyhV8Bow9rQvdR7iXcsV6Zl2oPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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