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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca31380fc3c3f4f00ac837b257ed3aaadbb2ab95b4600408a3c0e03d691d3804' 
  AND token = 'ib9jjEQgYmC2FdvF6Sc0y3lmac3+YPt9/K82LVRcejE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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