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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e42b7d6f144030b01d4672d9a4b2b80513d12facb3cbc1a1ebf79769f8528e' 
  AND token = 'bG9BsA2iKEWeEKSRwScvv2JiXiD08ZR9nNsxGr8Ws+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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