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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eabe8fa97629a12e46993c09ae5792e8c638bab486c67c87c2ec84cbb80efdb' 
  AND token = 'r/pjVXhKx2kHf+MHNM1jpzo5P1/JCzxpdBOyVNMWPZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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