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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '214050cf722824b982f382c953a3093d8d54fa13df3200ffdac56ceac43d403e' 
  AND token = 'rbiNoUg72DmKH1xupJ3fWr1wXamg0OgSmCd99ZqF3L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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