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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d7e7845669f4943d0a5fb0886872a584b126845f172d13ee83ad1ed88a8b37' 
  AND token = 'Gabc3cwP1UYivs4yituFGu4vWnvNajZ49p35DitCqEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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