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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf4032393e8f9e04085f7595df3d366984f298f7769a82e28f5f04c8a89b93c' 
  AND token = 'bbFkv1tq4s/I71nbSS+sj5+GsuGuTGgKTYN3dBL8SKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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