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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd31352a6492e38e2c7c53051bfa5b51e52e75f7e5a2131203e160490d1b49bef' 
  AND token = 'LiQL8oMuXpYI7dAxNpAB2MmjgINCT2WA4auaHCF88rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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