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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffe89edc24018c16810ca01928ed871af95eebf2604f6540bb637e71d22577b0' 
  AND token = 'q6it6dnIyDuf+jnD9GIfv6O1C7Glude9HmWH5CMSrXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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