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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b4197eaefbe7074a5ff5489e65ba7bbfb5ce4681d35d1f88db9a263a92b1d93' 
  AND token = 'p1lP1gniKEysAGWQNmgJ4R45jN4ZDWnXPgLNpF55UHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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