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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd08225dd6755407024b3d223d4a79f6e9cf1eb70745d72f20fda07f74542f4a' 
  AND token = 'yg5zT+iQ9uJ0IigqcY6JClj3H5EavxVSl3HhhGpGcDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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