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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f95ea8d2e4e008d38f24ac942f10f4a8c1ea5e7b0f2d81a4fae24ef3c93a77' 
  AND token = 'cfxy+WxcrEXiu6sARqGxyyGVlsRzKj8h9niFkJiHR1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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