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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c45fbcffa9d47ec4bcfefc160c44a70e4afedb9969e52b96658c6842e8cbf300' 
  AND token = 'HJZz/di5qv6kEmzVn9FnkGv1jI+ga1JXSRe714E+J2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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