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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63fc257cf8592b1e01be2bdd869b5ba9f9ccb7a1fbb852079bb81c2451a86f95' 
  AND token = 'fbn2tUQ0XJr799V8xdSLjNDLi8Xg+weBQFjY+xyGsbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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