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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0577d41696fff4a9d464981c856d1f32424c66d50bc80aa2d63a76e2b84e861' 
  AND token = 'bKIKSry9mRcoieQ9zQf/z8EKk3Yr/Kwf/Qfay54s1MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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