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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c89bb998cad8bd216d415dde82e3eb9839a4583530350b2d3b619a624da7f61d' 
  AND token = 'K8XnkK9bvPL6gL2lRHBj+HJ4Aai2rb87IhvD0Fl9GTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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