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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '021e3d1de9736dcb208b6299a2f281ffc68bb887bfc6f8219c4de068d2914a8f' 
  AND token = 'qDB6y6GEsXPV6R95pwNiqQdq/hTTByRF6Gd3+htprZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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