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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b632a80263bae75be736937ca3b59a21d940b1433ae681f09b774a980381df18' 
  AND token = '7PD4lXQmUNy7DPJ+4gziSss8J+Rk6zutpI2kzKMTkek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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