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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23534aea72812dc63dafa48ce9ac9563e3ec49c27dfb6a38fc9dadd9fc075394' 
  AND token = 'cSVGUMFpAw/VAIDD0/vng+piyLH7CJAotlHUQKOWSMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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