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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c470ed4815af3ceca56975e60caf29486969308ebcb5064c220d691232d13ec7' 
  AND token = '0x5JXVA87XWhOuE3b1O9q+zaMLl+Lz8G8h8eW7jxvJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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