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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0229eb55ea40197acffd82b7e4e30ab1cb84db13b85ca1e52a8c4ebb089623ac' 
  AND token = 'vQmYv6mzTdLUHufI2zEPucG18+PXXIzR6Jx8yYG18fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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