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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6411c45ef3f3831c93e7bc213d3e6bea379074faf52d85b25934f79ed6ada8cc' 
  AND token = 'AY1d+bmh9Ill1G/VcfKrOjA9omvYSxeMRmSgkEYEJoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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