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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '710d18afe48eb6b1cacf4a6df12718d0a3bb99f9aa2881bf3e41aad6681c1ffa' 
  AND token = 'EvJEMut+UhDwk6nonrNjbsJdwtt9PKQU9oV4XwJ2Lu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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