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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54b3d9b74e0e6c43df43c736a600be14dacb8ea2332848bdc7f5bf090525a463' 
  AND token = 'z9eW0ECTPNjQNXJf3/uquLQtVBfvZbJCi8h44JmKqc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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