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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ee9e758eed2fe05e7a74e2ab359804c433686a8f1aa39171f77a43aba41877' 
  AND token = 'NxBzEIxZ/9Ps+HAVr1eQHqM0TAMoxca64Wh7x/nbVmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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