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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '268bc26d8d6baea8c5aead0c25f23f93d6260b93f29404391a529e54e05aaff7' 
  AND token = 'Ukemln6EifQNoaJbb8o8TspqSAmoh83Pj3SyUewOOCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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