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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd855171c5ef0304ee79e12c6bacfa06fcdd7c262c38193c28f2a9f38b4f6f9a1' 
  AND token = 'ooK5W3JilbkWY6N4oRez8MEL8p1mMXIol+jaG3VnmuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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