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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a92fc7945b07b57c695a2993af7f6c7b1bbff586e3b5a42747d9a9390538a9ac' 
  AND token = '29hsy7V87OT3uJLgZJmEaC7cd4NptiJjH6EkeE0XZuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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