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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7db33b3c7d9dc92802b3c1cbe1371e94d0e056e6ca28a15d2746f4c2d7c1b347' 
  AND token = 'IhfaqhpMDjsAMX+NwC+oPTKgprmxrk3gTryD6rLBARU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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