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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceae7ed89f153e95272e90f35ec75700f4e867a917d0ead27e6d221c7c9740e0' 
  AND token = 'ajTjo7y48ZnvpTQ6YsccYX+qTX3S2R0z5qq+1BLNgZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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