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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a87688e84dcef19ad5fd0a0880da39e0d9c511e4940bb1edbd45d66ab495d2a' 
  AND token = 'BfSj1h2USPNYq17THhw15saYhI6nTGql03Zg+5dv1Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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