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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '380460b35029139252ea65620d1dd8b9f398e975db8c29616b9ba2535095c7fe' 
  AND token = 'TRLeprMd1J8N+mhfXPv3b5xKiJMt/Fh7ScXRyNKi/WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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