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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aaac3499112574c736eb5202f9121cd65ba7d85921ffac19be1f80ccc61a5bf' 
  AND token = '4erRYgRV04pfvToGyTpi3djuB9YEC507n8CS4SeF7JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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