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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74cb119863a15445d114e00a547b211676da42210482353473fded86ab6711bc' 
  AND token = 'Ns5ClDRkmAv+c1f7GEX/TlRRvgOK2kBN7Gfe1WTYnqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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