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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd001a50fac3f3e6ad0bb8673544f1560d9eccf7df586defbf7d4c4d023c15b2d' 
  AND token = 'wVhW2Xa+Z9dqTSfqwtZ1PL9poMkRrKcRtIfotOWWyc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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