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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbcaaa422017bec58bda0b00d59100414b58139cfbc15064d3b456239bf9d15a' 
  AND token = 'ZVO1F67hzvw7RzYaBw2XvoWCYJz84trCThpYOUbACCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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