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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '376dd54fcb6a2eacd339650e977d0d2a8c4b1e84106cad0d61fa63c353fc71e3' 
  AND token = 'i2j082tOF9RLYzJ6LzYTA4WRe+4EyciqjKqUR3jjUzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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