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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70aa868cd294f34508ad4353b27344e1e68c8515ff27ad6f3a68e240fff4d9b7' 
  AND token = 'daPdNOLpvruvtN3C0VP7hSBj0VIS8eY3NDJIDdYlMgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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