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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebd3652b76e87b05d920eaa8f955aabef3b24d897f6a3cc85e5756666322b6fb' 
  AND token = 'GQBVBGM1lXuAfsb7nFqa5WlPqLlCzTrKEv9P/HN5yRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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