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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f56f4004dbd7b4ea9112a0d861d93c576d0f363bc779ffef74bddf240b33556' 
  AND token = 'akvQk894y/kyhykDfTjlOKzU5l5BtNEZFMkK3CR4Rc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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