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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64ce93abfa90ad9a96c7c88ad4a698a3a839d3323fd75fbff4aa2c346fc0e462' 
  AND token = '2D0X55A8FdasAgtZcEs7RrYw0urGAmcoHixCN8486P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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