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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4a34338dbe86bc3878271ad02d95e652986c8ebd2a58d04c875b21062c271f3' 
  AND token = '58kQrh1FjOb73TwqQdyG0bH5xx5sjjSFCElcSETj70g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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