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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bd091df3bff8de32fa4eaa690cf331c138859593dc2e272ddc06f7df1f4c370' 
  AND token = '77IdVyNOVfCpP/cua+LX6bxo0fymob5f9qeBCAGV9+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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