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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc97f8cfa01ee77b1e9866ea9e36fb14bc6dbdef36fcfc6d8fdb305ae55ce2c' 
  AND token = '9wxEquNFOQPMJFVsoqd/woiIty7s/dj805QhUnzdcvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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